Drill steel extractor



5m 23, 136. J. c. cum'xs DRILL STEELBXTRACTOR Filed June 18, 1954 2 Sheets-Sheet 1 I .IIIHH J HN C. CUET/S INVENTOR ATTORNEY e 23, 1936. J c, U -n5 2,044,877

DRILL STEEL EXTRACTOR Filed Jupe 18, 1934 2 Sheets-Sheet 2 WWW WI JOHN c. coir/5 INVENTOR ATTORNEY Patented June 23, 1936 UNITE D STATES PATENT OFFICE DRILL STEEL EXTRACTOR Application June 18, 1934, Serial No. 731,121

8 Claims.

This invention relates broadly to rock drills, but more particularly to a rock drill equipped with a power actuated mechanism adapted to feed the drill toward or away from the work.

One object of this invention is to equip a rock drill with a device capable of functioning for extracting a drill steel which has become stuck in the drilled hole.

Another object of this invention is to provide a rock drill with a device adapted to deliver extracting blows to the drill steel when it has inadvertently become stuck in the material being drilled.

Another object of this invention is to provide ancillary to the foregoing reside in the specific construction and aggroupment of the elements peculiar to this structure, as will become apparent from a more complete examination of this specification.

In the drawings which illustrate the invention: Fig. 1 is a side view of a carriage having -a rock drill thereon embodying the invention.

Fig. 2 is an enlarged cross sectional view taken in a plane indicated by line 2-2 in Fig. 3.

Fig. 3 is an enlarged view partly in section of the rock drill mounting illustrating the rock drill in position for normal feeding motion toward or away from the work.

Fig. 4 is a View similar to Fig. 3 illustrating the rock drill in impact receiving position.

Referring to the drawings in which like symbols designate corresponding parts throughout the several views, I 9 represents a supporting frame having wheels I! rotatably mounted thereto. For securing the frame tothe ground, there is provided a plurality of adjustable legs or pins l2 secured to frame it] byset screws l3.

Pivotally secured to the frame ill, there is a cross member l4 having pivotally mounted thereon an elongatedframe l5 comprising a tube l6 having secured thereto a duality of guides I! ex- 5 tending the full length of the tube. Secured in the'interior of the tube at a place substantially equidistant fromthe ends thereof, there is a partition l8 having reciprocable therethrough a piston rod l9 terminated at each end with a piston 29. 'I'liepistons' 20 are conveniently machined to receive a sprocket wheel 2|. Pressure fluid may alternatively beadmitted in the feed tube I6 throughthe conduits 22 and 23 for causing the reciprocation of the piston 23, which is transmitted to a member, hereinafter denoted as slide 24, by means of a chain 25 engageable with the sprocket 2|. The ends of the chain are secured to the ends of the feed tube I 6, while the slide is secured to the chain at a place substantially equidistant from the ends thereof. The feeding mechanism being identical to the mechanism described in my pending application, Serial No. 654,802 filed February 2nd, 1933, now Patent No. 2,029,223, no further explanation of the same is thought necessary.

Toward the tube 16, the slide 24 is formed with a duality of longitudinally disposed grooves or guideways-26 adapted to receive the guides I! for slidable guided movement thereon. Similarly disposed within the upper portion of the slide 24, thereis another pair of guideways 21 adapted to slidably receive the guides 28 of a rock drill cylinder 29, which has secured thereto by a pair of bolts 44, a front housing 30 having rotatable therein the usual chuck 3 I The bolts 44 are subjected to a tensional stressby co-operating nuts 45 engaging flat surfaces, which are formed on the fronthousing 30 adjacent the end thereof engaging the corresponding end of the motor 29. Depending from-front housing 30, there is an enlarged lug 32 of a width substantially equal to the external diameter of the cylinder 29, and having the front and the rear face thereof substantially normal to the center axis of the cylinder 29, i with the exception of the lower portion of the front face which is beveled as at33 for the purpose which will be explained hereinafter. Toward the front, the slide 24 is provided with a transversally disposed opening or slot 34 defining side walls 35 and 36 normal to the center axis of the cylinder 29 and capable of engagement with lug 32. Toward the side wall 35, the slide is provided with a square bore 3Tleading from the bottom of-the slot 34 and adapted to receive a square plunger 38 provided with a bevel. 39 of an angle corresponding to that of the beveled portion of the lug 32. The plunger 38 is constantly urged toward the rock drill cylinder 29 by the effort of a compression spring 40 interposed between the bottom of the bore 31 and the inner end of the plunger 38.

Mounted within the chuck 3!, there is the shank 4| of a drill steel 42. The shank is provided with the usual lugs 43 capable of abutting engagement with the chuck for limiting the slidable and rotatable relative movement of the former within the latter.

Within the interior of the rock drill cylinder 29, there is provided the usual rotation mechanism comprising a ratchet ring a rifled stem associated with the piston reciprocable with the cylinder for imparting rotation thereto. The piston is also connected to the chuck 3! in the common manner for imparting rotation thereto, which is transmitted to the drill steel 42 by the lugs 43.

During the normal operation of the mechanism,

when pressure fluid is admitted into the feed tube [6 through the conduit 23, it will act on the upper piston 20 (not shown) to drive the slide by means of its chain connection therewith, in the direction indicated by the arrow in Fig. 3. The side wall 35 of the slot 34 engaging the front housing lug 32 will transmit the movement of the slide to the rock drill for feeding the latter toward the work. When it is desired to move the rock drill away from the work, pressure fluid may be admitted into the feed tube I6 through the conduit 22. The pressure fluid acting on the lower piston 20, will cause, due to the chain connection of the piston with the slide, the upward movement of the latter. The relation of the plunger 38 with the side wall 35 of the groove 34 is such that when the side wall 35 is engaging the lug 32, the bevel 39 of the plunger 38 is engaging the beveled portion of the lug 32, securing thereby the rock drill against relative longitudinal movement with the slide 24. The tension of the spring 40 is sufiicient to maintain the plunger 38 in its engaging position with the lug 32, against the weight of the rock drill tending to move the plunger inwardly due to the inclined wall en'- gagement of the latter with the lug 32. During the normal upward movement of the slide in the direction illustrated by the arrow in Fig. 4, the plunger engaging the lug 32 as shown in Fig. 3 will transmit the upward movement of the slide to the rock drill.

When the drill steel 42 has inadvertently become stuck in the drilled hole, it has been found that the normal lifting power of the feeding mechanism was not sufficient to pull the stuck drill steel. In the present construction, when the drill steel is stuck in the drilled hole, the lifting power transmitted from the piston 20 to the slide 24 by the chain 25, will cause the bevel 39 of the plunger 38 to ride the bevel portion 33 of the lug 32, thus driving the plunger 38 into the bore 31 against the compression spring 4!]. Immediately after the plunger 38 has left the beveled portion 33 of the plug 32, the slide is driven upwardly relatively to the rock drill until it is suddenly arrested by the engagement of the side wall 36 with the lug 32, thus delivering a powerful blow to the latter tending to pull the stuck drill steel from the drilled hole. The blow delivered to the lug 32 of the housing 30 is transmitted to the drill steel due to the abutting engagement of the lugs 43 thereof with the chuck 3|. If one blow is suflicient to loosen the drill steel, the slide together with the rock drill and the drill steel will move upwardly. When more than one blow'is necessary to loosen the stuck drill steel, the operator may reverse the movement of the slide by admitting pressure fluid in the feed tube l6 through the conduit 23'. In this instance, the slide is driven toward the work or in the direction illustrated by the arrow in Fig. 3, while the rock drill remains stationary and is supported by the drill steel. It will be understood that since the 5 slide 24 is hitting the front housing 39, or its lug 32, in an upward direction, the bolts 44 are not subjected to an additional tensional stress under which they would be subjected if the blows were directed to the motor 29 above the housing 30. During the relative slidable movement of the slide with the rock drill, the plunger 33 rides the lower wall of the cylinder 29, overcoming thereby the effect of the compression spring 40 tending to drive the plunger out of the bore 31. When the 15 side wall 35 of the slot 34 reaches the lug 32, the plunger 38 is again moved outwardly for engagement with the lug 32 as shown in Fig. 3. The operator may then reverse the movement of the slide for imparting an additional blow to the lug 20 32 in the manner previously described, and he may repeat that operation until the stuck steel is loosened from the drilled hole.

In certain cases, it has been found advantageous to rotate the drill steel when extracting the 25 latter from the drilled hole. In this instance, the operator may cause the operation of the rock drill by admitting a restricted amount of pressure fluid therein, sufiicient to cause the rotation of the drill steel. While the drill is thus rotated, the operator may manipulate a throttle valve for admitting pressure fluid into the feed tube 16 to cause the slide 24 to deliver blows to the hous ing 30 in the manner previously described, thus producing an efiicient mechanism capable of rotating and delivering extracting blows to the drill steel.

Although the foregoing description is necessarily of a detailed character, in order to completely set forth the invention, it is to be understood that the specific terminology is not intended to be restrictive or confining, and it is to be further understood that various rearrangements of parts and modification of structural detail may be resorted to without departing from the scope or spirit of the invention as herein claimed.

I claim:

1. A mechanism for extracting a stuck drill steel from a drilled hole comprising a driven member adapted to receive the drill steel, a driving member having guideway on its upper face within which said driven member is sildably mounted, said driving member being capable of engagement with said driven member for imparting drill steel 55 extracting blows thereto, and coacting means connecting said drill steel to said driven member whereby the blows imparted to the latter are transmitted to the former.

2. A mechanism for extracting a tool from the 60 work comprising a frame, a fluid actuated element slidable on said frame, a member carried by said element having a tool therein for movement therewith, a connection between said member and said element through which the slidable movement of the latter is transmitted to the former and consequently to said tool for normally imparting feeding motion thereto away from the work, and releasable means included in said connection whereby said element is capable of slidable movement relative to said member for imparting a tool extracting blow thereto when said tool is subjected to a predetermined amount of resistance adversed to said feeding motion.

3. A mechanism for extracting a drill steel from 75 a drilled hole comprising a drill steel receiving member, a power driven element having guideway on its upper face within which said member is slidably mounted, said element being associated with said member for normally imparting longitudinal movement to the latter away from the drilled hole, coacting means connecting said drill steel to said member whereby the movement imparted to the latter is transmitted to the former, and means whereby said element is automatically capable of limited slidable movement relative to said member for delivering a blow to the latter when said drill steel is subjected to a predetermined amount of resistance adversed to the movement of said member.

4. A mechanism for extracting a drill steel from a drilled hole comprising a frame, a power driven element slidable on said frame, a drill steel receiving member capable of limited slidable movement relative to said element, interengaging means connecting said drill steel to said member whereby the movement of the latter away from the drilled hole is transmitted to the former, a lock for normally locking said member against slidable movement relative to said element, said lock being movable out of locking engagement, and means whereby said element is capable of delivering a blow to said member immediately after the movement of said lock out of locking engagement.

5. In a drilling apparatus, the combination with a frame, a power actuated drilling motor slidable on said frame having a tool normally operated thereby, a power actuated feeding mechanism associated with said motor capable of imparting feeding motion thereto away from the work, and means responsive to the actuation of means under tensional stress for securing said housing to said motor, and a power actuated mechanism associated with said motor capable of imparting a blow to said housing for extracting the tool from the work, said blow being imparted in a manner preventing said securing means to be subjected to a tensional stress additional to the one aforesaid.

7. In a drilling apparatus, the combination of a frame, a slide movable relative to said frame, feeding means for the slide, a motor having a casing positioned on the slide, impact surfaces on the casing and slide, a tool carried by the motor, and an automatically releasable connection between the slide and motor for imparting impact blows to the casing to extract the tool from the hole when it becomes stuck.

8. In a device for extracting stuck drills from a bore hole the combination of a frame, a slide movable on the frame, power means for moving the slide away from the hole being drilled, a motor movably maintained on the slide, a drilling tool carried by the motor, impact means positioned between the slide and the tool, and means releasing the motor for movement relative to the slide when the tool becomes stuck in the bore hole so that the impact means may impart an extracting blow to the stuck tool.

JOHN C. CURTIS. 

